Insulator suspension yoke



Aug. 16, 1932. K, HAWLEY 1,871,519

INSULATOR SUSPENSION YOKE Filed July 10, 1929 Patented Aug. 16, 1932UNITED STATES v KENT A. HAWLEY, F BALTIMORE, MARYLAND, ASSIGNOR TO LQCKEINSULATOR COR- PORA'I'ION, 0F BALTIMORE, MARYLAND, A CORPORATION OFMARYLAND,

INSULA'IOR SUSPENSION YOKE Application filed July 10,

The invention relates to suspension yokes for a plurality of strings orchains of insulators used for supporting high tension transmissionlines.

1 It is well known in the art that it is a common practice to make useof a plurality of tered owing to the fact that when onestring ofinsulators breaks a severe cantilever or twisting strain will come uponthe suspension elements which connect the upper and lower ends of thestring of insulators to the yoke arms, This is naturally a seriousdisadvan tage and it is to remedy this condition that I have devised thepresent invention which has for its general object the provision of asuspension yoke and connections between the I 2 same and the insulatorstrings of such charactor as to avoid the brlnglng of any heavy twlstmgor other s1m1lar strams upon the parts, the arrangement being such thatthe yokes at the 'top and bottom of the strings may move and accommodatethemselves to a new line of pull so that the load will be at leastsubstantially equalized and danger of breaking any of the apparatusavoided.-

An important object of the invention is to provide a suspension yokestructure which may include counterpart members at the top I and bottomof the strings of insulators so that only one type of yoke will benecessary to effect installation.

Another object of the invention is to provide a suspension yoke deviceand insulator connections or suspension elements engaged therewith whichmay, be very quickly and will be positively maintained in place againstaccidental detachment while capable of hav- 7 ing free movement to bringabout equalization of strains. s

An additional object is to provide a device or structure of thischaracter which will be easily applied and which after application I ggaged with n a hole V16 111- the hub portion 1929. Serial no. 377,237.

simple and inexpensive to make,easy to install,positive in action,eflicient and'durable in service, and a general improvementin the art; e

To the attainment of the foregoing and other objects and advantages, theinvention preferably consists in thedetails of construction and thearrangement and combination of parts to be hereinafter more fullydescribed and claimed, and illustrated in the"accom- The upper yoke A isintended to be suspended Om a support, as by means of a clevis D or thelike while the lower yokej B is intended to 'carry a conductor holdingclamp. or the like, notshown. In the present instance there are threestrings of insulators in the installation and it is for use inconnection with such that fmy yoke is specially designed. Naturally itis immaterial how the top yoke is suspended and likewise makes nodifference In carrying out the invention I form the yoke A or B as ahub'member 10 from which to make the device by casting. The suspensionmeans is represented asicompri'sing an eye bolt l'having its sha'nk15rotatably enor memberWlO, theextremity of the shank being threaded andcarrying a nut 17 which is .preferably cottered at 18 to preventdetachment; At the base of the shank 15 the eye-bolt is disclosed" ashaving an angular what type of conductor clamp is used as such detailsvary in diflerent installations.

fill

vof the lowermost insulators.

lower yoke B is inverted with respect to the. upper one. The drawingshows the strings The means for mounting the strings of in sulators ishere shown as comprising elongated loops 21 of substantially ellipticalshape, these loops being swingably engaged upon the hooks 12 and beingshown as .en-

gaged within the clevises of ball head mem-' bers 22 connected with thecaps'of the u-ppermost insulators and within the clevises of socketmembers 22' connected with the pins Of course the as broken away as theyare naturally of indeterminate length depending .upon the voltagecarried in the transmissionlines. To prevent the links 21 fromdisengagement from the hooks 12, I may provide pins :23 passing throughthe-bight portions of the hooks and extending partly across the openportions,

cotters 24 being provided for preventing v claims hereunto appended.

withdrawal of the pins.

In the use .of the yoke, it is apparent that theyare arranged in opposedrelation and connected with the strings .of insulators as shown, theuppermost yoke being suspended from a tower or other support and thelowermost one carrying a suitable .clampfor holding the conductor. Underordinary conditions the strain isdivided between the three strings ofinsulators.

In the event that one .of the strings should break, possibly as theresultof .a mechanical defect in a :casting or the cement which holdsthe hardware, or .as

the result of an arc burning away the hardware at an intermediate point,the load will then he sustained by the other two strings. .However, whensuch a contingency occurs it is clear that the yokes will move out oftheir initial or normal positions as the parts of the installation .mustaccommodate themselves to the line of strain. With the ordinary type ofyoke having .clevis connections with the insulator strings severetwisting strains and bending strains are set up in the connections.However, with this form of yoke and owing to the suspension :of theinsulator strings by parts. "movement as it is apparent that the loopscan swing freely and also move laterally to "a limited extent withrespect tothe hooks 12 and as the insulator strings can swing freelyupon the links. There is an additional feameans of the elongated loopsall of the parts can turn, twist or move into different lines withoutbringing dangerous strains upon and over-taxing the mechanical strengthof .the This is all due to the freedom of ture of advantage and that isthat the plane in which all the hooks lie is spaced considerably belowthe connection of the suspension eye bolt 14: with the yoke. Thisreduces the cantilever strains which come upon the equipment in theeventof breakage or other letting go of one of the strings.

From the foregoing description and a study of the drawing it will beapparent that I have thus provided a very s mple and inexpensive yokestructure by means of Which the maximum efliciency in point of equaliza"tion and other features is obtained. Instalas the right is reserved tomake all such changes in the details of construction as will widen thefield of utility and increase the adaptability of the device providedsuch changes constitute no departure from the spirit of the invention orthe scope of the Having thus described the invention, I claim: I

1. A yoke for supporting a plural ty of strings of insulators,comprising a hub member provided with suspension means and. having aseries of inclined diverging arms radiating therefrom and terminating inhooks, horizontal brace elements connecting the intermediate portions ofthe successive arms and means swingably engaged upon the hooks andadapted for connection with the ends of the insulator strings.

2. A yoke for supporting a plurality of strings of insulators,comprising a hub member provided with suspension means and havingaseriesof inclined diverging arms radiating therefrom and terminating in hooks,elongated links swing'ably engaged upon the hooks and adapted forconnection with the ends of the insulator strings, and means partlytraversing the open portions of the hooks beyond the links forpreventing detachment of the latter.

3. A yoke for supporting a plurality of ber provided with suspensionmeans and having a series of inclined diverging arms radiatmg therefromand terminating in hooks,

elongated links swingably engaged upon the hooks and adapted forconnection with the ends of 'theinsulator strings, and pins extendingthrough the hooks and partially obstructing the open portions thereoffor preventing withdrawal of the links.

4. A yoke for supporting a plurality of strings of insulators,comprising a hub member having a series of inclined arms radiatingtherefrom and terminating in upwardly directed portions defining hooks,brace elements extending between and merging into the successive arms,and elongated links swingably engaged upon said hooks for connectionwith the ends of the insulator strings.

5. A yoke for supporting a plurality of strings of insulators,comprising a hub member having a series of inclined arms radiatingtherefrom and terminating in upwardly directed portions defining hooks,brace elements extending between and merging into the successive arms,and elongated links swingably engaged upon said hooks for connectionwith the ends of the insulator strings, said suspension membercomprising an eye bolt having its shank passing through said hub member.

6. A yoke for supporting a plurality of strings of insulators,comprising a hub member having a series of inclined arms radiatingtherefrom and terminating in upwardly directed portions defining hooks,brace elements extending between and merging into,

the successive arms, and elongated links swingably engaged upon saidhooks for connection with the ends of the insulator strings, saidsuspension member comprising an eye bolt having its shank passingthrough said hub member, the bolt having angular portions and the hubmember having spaced lugs located outwardly of said angular portions forlimiting rotation of the bolt with respect to the yoke.

In testimony whereof I afiix mysignature.

KENT A. HAWLEY.

